The Nomos Tetra features an in-house movement with sapphire crystal back. During our visit to the Nomos workshops, we saw first hand the production of these movements, including all of the intricate operations necessary to cut and clean the metal using two separate locations in the very small village of Glashtte, Germany.
The movement begins with a traditional Glashtte 3/4 plate which is rhodium plated and decorated with Glashtte ribbing and Langeleist perlage.
Next, the ratchet and crown wheels are decorated with traditional Glashtte starburst patterns. Finely blued screws are used throughout, and other features include Triovis fine adjustment in four positions, hack mechanism, Nomos click, and power reserve of 45 hours.
The Nomos Tetra is the only non-round watch in the series, and features both a striking case design and dial pattern.
Beautiful silver/cream dial with inner square pattern. Watch features sub-seconds at 6 with blued steel hands. The dial is first sand blasted, and then bathed in silver to produce its unique color and texture. The Nomos logo is engraved on the crown.
The case is made in a special steel alloy which is nickel-free. Case back is steel and features a sapphire display back to showcase the in-house Alpha movement, Nomos logo and the watch serial number. When you purchase this watch, your name and serial number are registered with Nomos entitling you to a US warranty.
The movement is entirely finished by hand, and blued screws are used throughout. This watch is water resistant to 30 meters. Sapphire crystal on front and back.
And last but not least - the strap. Nomos watches use hand stitched straps made from Shell Cordovan. The leather is very smooth, durable, water-resistant and extremely long-lived.